Saw for making secondary-battery grids.



No. 70l, 9l6@ Patented June; It), I902.

W. MORRISON.

SAW FOR MAKING SECONDARY BATTERY GRIDS.

(Application filed June 18, 1900.) (No Model.)

m: NORRIS Perms o0. movoqmcu wuummon. u. c.

UNITED STATES P T T OFFICE.

WILLIAM MORRISON, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE HELIOS UPTON COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF NEW JERSEY.

SAW FOR MAKING SECONDARY-BATTERY G RlD S.

SPECIFICATION forming part of Letters Batent N 0. 701,916, dated June 10, 1902. Application filed June 18, 1900- Serial No. 20,663. i (No model.) I

To all whom it may concern:

Be it known that 1, WILLIAM MORRISON, a

This invention relates tosaws for making secondary-battery grids, and has for its object to provide a construction whereby a higher degree of efficiency may be obtained and a better class of work produced. Battery-grids for secondary batteries; in the construction of which saws embodying my improvements are to be used,are made from blanks in the form of plates or thick sheets of lead, and the saws are employed in gangs for the purpose of cu tting the lateral surfaces of these lead plates into a plurality of parallel grooves, leaving between the grooves intermediate projections. In practice it has been found exceedingly dif ficult to construct the saws insuch a manner that they will properly enter the lead to the desired depth and out the grooves ina uniform and rapid manner without clogging.

the saws or destroying the lead plate.

It is the object of my present invention to.

produce a saw which will obviate thesedifticulties and to that end the invention consists in certain novel features, which I will now proceed to describe and will then particularly point out in the claims.

In the accompanying drawings, Figure l is a side elevation of a saw embodying my in-' a whole, it being formed from a disk of steel or other suitable material and provided with a central aperturefl to receivethe arbor on which it is mounted and witha keyway 3 to receive the key by means of which it is socured on said arbor. The body of the saw is made tapering or of gradually-diminishing thickness from its periphery toward its conteeth 4, having the usual gullets 5 between them. Each tooth has, in addition to the curved front portion forming the gullet, an inclined back portion 6, and its 'outer extremity is beveled from its point to a junction with the inclined back portion 6, as indicated at 7, to form a peripheral clearance. In order to give a lateral clearance, each tooth is cut away at one side, as indicated at 8, and I prefer to-thus cut away that portion of the tooth which lies above and forward of the point of junction of the parts 6 and 7. Any portion of the tooth within half of its width may, however, be thus out, if desired. The lateral cutting away of the teeth is alternate as to the sides upon which the cutting is done,

so that any one tooth of the saw is cut away on the side opposite to that on which the tooth in front of it and the tooth behind it are cut away.

.In practice'saws haying teethofjull width arranged in the same plane are foundto be ill-adapted for the cutting of grooves in lead "plates, particularly when used .in gangs, as

they will not enter the plate unless great pressure is applied and will clog and pick up and destroy the plate. I have also found that it is not practicable to set the teeth of such saws in the usual manner, for therea'son that the set cannot be made even throughout'the saw or throughout thesaws of'the gangs. With a saw constructed as hereinbefore set fortheach toothis sufficiently narrow to read ily enter the lead as to its cutting portion, and since it cuts less than the full width of the groove there will, be ample lateral clearance and the sawwill not clog or tendto'pick up the leadv plates operated upon, while at the sametime the grooves will becut uni= formly and of full width and depth. jlhe saws as thus constructed are generallyusedin gangs, as shown in Fig. 2, being mounted upon an arbor 9 and spaced apart by meansof spacing disks or washers 10 and held in po sition by a key 11. The diminishing thickness of the saws toward the center serves to effectually prevent any clogging between the saws composing the gang by any wedging of ter, and at the periphery it is provided with the metal operated upon between said saws. A particular advantage in the use of the saws having their teeth cut away laterally is that the shavings or ribbons of lead produced by each tooth are of less width than the space between the saws, and there is consequently ample clearance between the saws for the lead thus cut out in forming the grooves.

In constructing saws of diminishing thickness toward the center it has heretofore been customary to first punch the teeth from the saw-blank and then grind the faces of the saw in order to obtain the necessary taper or diminution in thickness toward the center. I have found in practice that this results in injury to the marginal edges of the teeth, which are rounded off by the action of the grinding-toolin forming the taper referred to. I therefore in constructing myimproved saw proceed to first grind the faces of the blank, so as to give it the necessary taper or diminution in thickness toward the center, and subsequently form the teeth by grinding after the saws are assembled on a suitable arbor or mandrel for that purpose.

It is obvious that the details above described may be modified-as, for instance, by cutting away only the alternate teeth laterally, leaving the intermediate teeth of full width, in which case said full teeth would only cut one half of the kerf, the other half of the tooth being idle.

I claim- 1. Asaw for making battery-grids, &c., having a body of less thickness than the width of its teeth and having teeth of regularlytapered diminishing thickness from their cutting edges inwardly toward the body and laterally cut away on alternate sides, substantially as described.

2. A gang of saws for use in making battery-grids, comprising an arbor, a plurality of saws secured thereon and each having a body of regularly-tapered diminishing thickness from its periphery toward its center and its teeth cut away laterally on alternate sides, and spacing disks or washers between the saws, substantially as described.

3. A circular saw for use in making battery-grids, having a body of regularly-tapered diminishing thickness from its periphery toward its center and provided with the teeth 4, each having the inclined clearance-bevel 7 and the lateral clearance-bevel 8, substantially as described.

WILLIAM MORRISON.

\Vitnesses:

FREDERICK O. Goonwm, IRVINE MILLER. 

